Electric heater.



H. A. GAMBLB.

ELECTRIC HEATER.

APPLICATION FILED IBB.20. 191s.

UTE@

HUGH A. GAMBLE, OF GREENVILLE, MISSISSPPT ELECTRIC HEATER.

Specieatioiiof Letters Patent.

ipatented Sept. 151,

Application led February U, 1913. Serial No. 749.6527'.-

new and useful Improvement in Electric.

Heaters, of which the following is a specii'ication.

My invention is an improvement in electric heaters for drop enema, and has for .its object the provision of a simple, inexpensive and easily operated heater ot' the character specified, for maintaining a uniform temperature in the solution during its administration.

1n the drawings z-Figure 1 is a longitudinal section of the heater, and Figs. l and 3 are enlarged sections on the lines 2 2 and 3-3 respectively of l? ig. 1.

rihe present embodiment oi the invention consists oi' a receptacle. composed ot outer and inner casings 1 and 2 of cylindrical or oval form, each having closed ends and ilrespectively, and the said casings are aie ranged in spaced relation, and a filling 5 of asbestos or othernon-heat conducting mattL rial is ar y'anged between the said casings.

An opening (i is arranged at the upper end ot the receptacle, and the said opening is normally closed by a threaded plug T, thesaid plug forming a liuid tight closure for the openino'. A coil 8 of tubing of suitable cross section arranged within the receptacle, and the ends 9 and 10 or the coil are passed ont through the ends of the receptacle at approximately the center of the said ends.

A. valve casing .11 is connected with the end 9 oi' the coil, and an ettension pipe 12 is arranged beyond the casing, the said extension pipe having an enlargement 13 over which is adapted to be slipped one end of a rubber tube 14. The end 10 of the coil is also provided with an enlargement 15, and the one end of a rubber tnbe 16 is slipped over the said enlargement, the enlargements 13 and 15 being designed to prevent displacementof the tubes 14 and 1G respectively.

A thermometer 17 is arranged within the rubber tube 14 just beyond the enlargement in such manner that the graduations 18 thereof are exposed tol view, the said ther-- mometer being so placed tov register the heat of the solution passing through the tube.

The ends ofthe receptacle are provided witlieregistering openings, and a tubular structnre 1.() is arranged within the receptacle, the ends ot' the tubular structure engaging the respective openings at the ends of the receptacle. The tubular structure 19 is rectangular inecross section as shown in Fig. and an electric heater is arranged within the said tubular structure.

The bars; 20 and 21 of the heater extend beyond the .tubular structure 19 at each 'end thereof, and a switch 22 of any desired construction is arranged at the upper end of the receptacle for conncct'ng or disconnecting the heater and any desired source of electrical energy.

Leads 23 and 2i are provided for connecting the said heater with the source of snpply, and the receptacle is designed to be filled with hot water or other suitable liquid, which is maintained at the proper temperatare by the electric heater.

in operation, the solution is passed through the coil, by connecting the receptacle containing the same with the coil by means o t the tube, 16. The valve 11 is closed and the heater is then connected with the source ot electrical energy, and so left until the waterhas attained a. suit-able temperature.

The valve 11 may be then opened to permit the passage of the solution. 1t will be obvious that a suitable rheostat of ordinary form and therefore not shown, may be interposed in the circuit of the heater, to retain the liquid in the receptacle at the desired temperature. As soon the temperature reaches the proper point, this fact will be indicated by the thermometer and the solution is then ready for use.

i claim 1'. 1n a heater of the character specified, a receptacle for liquid comprising inner and outer casings arranged in spaced relation, and a filling of non-heat conducting material between the casings, the receptacle having a filling opening and being designed to receive a heating coil, and a tubular strncture extending from one end of the receptacle to the other and opening at the ends of the receptacle ttor receiving an electrical heating device.

2. in a heater ot the character specified, a spiral coil having a general cyl' ldrical fornn-the ends of the coil beifij' 4 of the' cylindrical guredescribed by the e thermomeer for indicating the ien'qyem coils, a nipple at each end (1icoil for engagement by flexible conductinc pipes, a 'vulve interposed between one ofthe nipples enl the adjacent end of the coil, and e iexibie pike engaging the nipple et the end ecb 'aeenfn te the veve casing and provided with ture of the liquid Honing; herefmm.

'.A-'UGH A. G3i MELE.

' Witnesses:

STEVE A. FINLAY, MAURICE A.. BERGMAN. 

